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Re: Tie down question


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Posted by showcrop on May 25, 2018 at 17:40:47 from (75.68.37.174):

In Reply to: Tie down question posted by Grandpa love on May 25, 2018 at 06:25:52:

Check your eye bolt to these specs in order to get YT DOT approval:

Forged Eye Bolt Capacity and Strength Calculator has been developed to show rated load capacities, proof load and breaking strength of a selected forged threaded eye bolt.

The Calculator uses the load charts of forged eye bolts which are given in the ASME B18.15 and ASTM A 489 - 04 standards.

Some important notes from the ASME B18.15:

- Capacities are for carbon steel ASTM A 489 eye bolts, at temperatures between 30°F (-1°C) and 275°F (135°C).

- Loads must always be applied to eye bolts in the plane of the eye, not at an angle.

- Plain eyebolts must be engaged to within one-half turn from the eye end of the threads to get rated capacities given by the calculator.

- Shoulder eye bolts should bear firmly against the mating part; otherwise the rated capacity must be reduced to ones given for plain eye bolts

- To attain the rated capacities given by the calculator, minimum thread shank length of engagement must be as follows:

-- Steel - 1 thread diameter,

-- Cast iron, brass, bronze - 1.5 thread diameter,

-- Aluminum, magnesium, zinc, plastic - 2 thread diameters

- Tapped holes for plain pattern (straight shank) eye bolts are threaded for the full length of eyebolt engagement. Tapped holes for shoulder pattern eyebolts are threaded for the full length with clearance for the unthreaded portion of the eyebolt to allow shoulder seating.

- For through-hole applications, long length eye bolts with shoulder are advised, using a steel washer and nut with the required thread engagement.

Calculator:

INPUT PARAMETERS

Nominal eye bolt size (inches)

Eye Bolt Type

Plain Pattern Eye Bolts

Shoulder Pattern Eye Bolts



Forged Eye Bolt Capacities

RESULTS

Parameter Value Unit

Nominal Size --- -

Thread Size ---

Eye Bolt Type ---

Breaking Strength, min --- lbf

Proof Load, min ---

Rated Capacity @ 0 deg. ---

Rated Capacity @ 30 deg. ---

Rated Capacity @ 60 deg. ---

Rated Capacity @ 90 deg. ---

Note : Proof load is calculated as 2 times the rated capacity in straight pull (0 degrees).

Note : NR - Not Recommended

Definitions:

Breaking Strength: The breaking strength shall be determined by screwing the lifting eye to the full thread engagement into a block secured in one jaw of the testing machine and held to the other jaw by means of a mandrel passing through the eye.

Proof Load: The load that can be exerted without causing permanent deformation exceeding 0.01 in. (0.255 mm) between small puncture wound punch marks at opposite ends of the diameter across the eye.

Rated Capacity: The maximum recommended load that should be applied on the lifting eye. All rated capacities, unless otherwise noted, are for in-line pull with respect to the center line of the eye bolt.


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